Today I discovered a ginormous hornworm on my tomato plants. I immediately got it off the plant and then sprayed it with organic insecticide to kill it. I looked and looked and looked but did not see any others on my tomato plants. But it's not possible for there to be only one is there? There is no noticeable damage to my plants but I know these things can work quickly and be quite destructive. I sprayed my plant with the organic insecticide to be safe. Should I keep looking for these things to pop up?
We are having a really mild fall, with temps still in the low 80s, so I
would like to get a few more weeks out of my plants if I can. They are loaded with tomatoes right now.